A store sells an electronic organ at a discount. The purchase price of an electronic organ is 1800 yuan. If it is sold at 20% off the price, the profit will not be less than 10% of the actual price, So what is the price range of electronic organ?

If the price is not less than 2500, it can meet the requirements

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1. If a bookstore sells a new book at a 10% discount on its price, it can still make a profit of 20% A. 26 yuan B. 27 yuan C. 28 yuan D. 29 yuan
2. Schindler electronics stores sell certain electronic products at a price of 12 yuan per piece and 20 yuan per piece, Every time you buy one more, the price will be reduced by 0.10 yuan, but the lowest price is 16 yuan / piece 1. Ask customers how many at least they can buy at the lowest price at a time? 2. Write the functional relationship between profit y (yuan) and purchase quantity x (pieces) when x pieces are purchased at one time (x > 10) 3. According to this kind of promotion method, please analyze: does the store sell more and earn more? If so, please explain the reason; if not, in order to make more money each time, try to explain through calculation: under the condition of other promotion conditions unchanged, how much should the lowest price be raised to 16 yuan / piece at least?
3. In order to improve teaching efficiency, the school wants to buy some TV sets to be installed in the classroom. The purchase price of TV sets is 1000 yuan, and the selling price is 1400 yuan. Because the school buys more TV sets, the store is ready to sell them at a discount. If the profit margin is 12%, how much discount does the store give?
4. A clothing store bought 100 pieces of a brand of clothing, the purchase price was 350 yuan / piece, and the price was set at 500 yuan / piece. After half of the sales, in order to finish the sales as soon as possible, it was ready to sell at a discount If the profit is not less than 12000 yuan, then the rest of the clothing can be sold at a maximum discount according to the price? (one yuan per time inequality) 2. If someone wants to go to area a 3.3km away, his walking speed is 90m / min, and his running speed is 210m / min. if he has to reach area a in another 30 minutes, how many minutes can he run? One yuan per time inequality) online, etc!
5. A shopping mall sells smart phones of brand a and brand B. the purchase price and selling price of these two kinds of mobile phones are shown in the table below: ·························A ·········· B Purchase price (RMB / unit) 4000 ·········· 2500 Price (yuan / unit) 4300 The mall plans to buy 50 mobile phones of two kinds, which will cost a total of 155000 yuan. How much gross profit can be obtained after all sales? (gross profit = (selling price purchase price) × sales volume)
6. A computer can make a profit of 215 yuan if it is sold at a price reduction of 10%; if it is sold at a price reduction of 20%, it will lose 215 yuan
7. A store has two calculators with different purchase prices, both of which sold for 80 yuan. One of them made a profit of 60% and the other lost 20%. In this transaction, the store How many yuan did you earn
8. A store has two calculators with different purchase prices. They all sold for 64 yuan. One of them made a profit of 60% and the other lost 20%. In this transaction, the store () A. No loss, no gain B. earn 8 yuan C. lose 8 yuan D. earn 32 yuan
9. A shop has two calculators with different prices. They both sold for 80 yuan. One of them made a profit of 60% and the other lost 20%. In this transaction, the shop lost 20% How much do you earn? Solve it with a linear equation of one variable (and why
10. A store has two calculators with different prices, both of which sold for 80 yuan. One of them made a profit of 60% and the other lost 20%. In this transaction, the store () A. Don't lose don't earn B. earn 10 yuan C. lose 10 yuan D. earn 8 yuan
11. The store gives a 20% discount on a certain commodity. It is known that its original price is 2200 yuan, and the profit margin after discount is 10%, indicating the purchase price of the commodity Equation solution)
12. A store sells an electronic organ at a discount. The purchase price of an electronic organ is 2400. If it is sold at 20% off the marked price, the profit will not be less than 10% of the actual price, What is the price range of the electronic organ It's mathematics, one yuan, one time!
13. The profit problem in discount sale The cost price of a store's clothing is a yuan. If the price is increased by 40% of the cost price, the price will be 〔 yuan. If the price is sold at a 20% discount, the actual price will be 〕 yuan, and the store will make a profit of 〕 yuan
14. The purchase price of a commodity is 150 yuan, and the price is 200 yuan. The mall decides to sell it at a discount. In order to ensure that the profit is not less than 20%, how much discount at most
15. The original price of an induction cooker is 800 yuan, but now the price is reduced by three fifths. How much is the price reduced? How much is the current price? The original price of an induction cooker is 800 yuan, but now the price is reduced by three fifths. How much is the price reduced? How much is the current price?
16. 1. The original price of a computer is 5000 yuan, but now the price is reduced by 800 yuan. How much is the price reduced? Now the price of each computer is the original price 2. There are 240 white rabbits and black earth rabbits in the farm, of which the black rabbit is one fifth of the white rabbit. There are more black earth rabbits and white rabbits each. 3. Xiao Ming read a book, and the first day he read 35 pages. The second day he read the atmosphere plants of the first day. In the two days he read a quarter of the book. How many pages is the book?
17. The following is a supermarket promotion price comparison table: induction cooker, the original price of 400, the current price of 320, TV, the original price of 2000, the current price of 168 The following is a comparison table of the promotion prices of a supermarket Induction cooker, original price 400, current price 320 TV set, original price 2000, current price 1680 (1) How much has the price of induction cooker been reduced (2) How much has the price of TV set been reduced
18. A supermarket has lowered the price of induction cooker twice. The first one is 20% lower than the original price. After the price reduction, each induction cooker sells for 380 yuan. The second one is 10% lower than the price after the first price reduction. Now how much is the price of each induction cooker cheaper than the original price?
19. After two price adjustments, a kind of clothes in the clothing supermarket returns to the price before the price adjustment. The first price reduction is 20%, and the second price increase is 20%______ %．
20. A supermarket has lowered the price of induction cooker twice. The first one is 20% lower than the original price. After the price reduction, each induction cooker sells for 380 yuan. The second one is 10% lower than the price after the first price reduction. Now how much is the price of each induction cooker cheaper than the original price?